Evolution of freshwater plumes and salinity fronts in the northern Bay of Bengal

doi:10.1029/2005JC003308

IOCAS-IR > 海洋环流与波动重点实验室

	Evolution of freshwater plumes and salinity fronts in the northern Bay of Bengal
	Wu, Lingjuan ; Wang, Fan; Yuan, Dongliang; Cui, Maochang
	2007-08-31
发表期刊	JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
ISSN	0148-0227
卷号	112 期号:C8 页码:C08017
文章类型	Article
摘要	[1] The evolution of freshwater plumes and the associated salinity fronts in the northern Bay of Bengal ( henceforth the bay) is studied using rotated empirical orthogonal function (REOF) analysis and extended associate pattern analysis (EAPA). The results show that sea surface salinity distribution is featured by eastern-bay and western-bay plumes in the northern bay during different seasons. The western-bay plume begins in early July, peaks in late August, and then turns into a bay-shaped plume with the two plumes in either side of the bay, which peaks in late October. The southward extension of the western-bay plume can be explained by the southwestward geostrophic flow associated with the cyclonic gyre in the northern bay, which counters the northeastward Ekman drift driven by wind stress. The offshore expansion of the western-bay plume is induced by the offshore Ekman drift which also produces a salinity front near the east coast of India. The bay-shaped plume appears when the cyclonic gyre shifts westward and a weak anticyclonic gyre occupies the northeastern bay. As the season advances, the western part of the bay-shaped plume decays while the eastern part persists until the following June, which is believed to be associated with the anticyclonic gyre in the northern bay. The evolution of the plumes except the eastern part of the bay-shaped plume in fall can be partly explained by the seasonal variation of mass transport associated with the Sverdrup balance. The fact that the western-bay (eastern-bay) plume appears when surface freshwater flux in the northeastern bay increases ( decreases) dramatically suggests that the plumes are not produced directly by surface freshwater flux. River discharge seems to be the freshwater source for the plumes and has little to do with the evolution of the plumes.; [1] The evolution of freshwater plumes and the associated salinity fronts in the northern Bay of Bengal ( henceforth the bay) is studied using rotated empirical orthogonal function (REOF) analysis and extended associate pattern analysis (EAPA). The results show that sea surface salinity distribution is featured by eastern-bay and western-bay plumes in the northern bay during different seasons. The western-bay plume begins in early July, peaks in late August, and then turns into a bay-shaped plume with the two plumes in either side of the bay, which peaks in late October. The southward extension of the western-bay plume can be explained by the southwestward geostrophic flow associated with the cyclonic gyre in the northern bay, which counters the northeastward Ekman drift driven by wind stress. The offshore expansion of the western-bay plume is induced by the offshore Ekman drift which also produces a salinity front near the east coast of India. The bay-shaped plume appears when the cyclonic gyre shifts westward and a weak anticyclonic gyre occupies the northeastern bay. As the season advances, the western part of the bay-shaped plume decays while the eastern part persists until the following June, which is believed to be associated with the anticyclonic gyre in the northern bay. The evolution of the plumes except the eastern part of the bay-shaped plume in fall can be partly explained by the seasonal variation of mass transport associated with the Sverdrup balance. The fact that the western-bay (eastern-bay) plume appears when surface freshwater flux in the northeastern bay increases ( decreases) dramatically suggests that the plumes are not produced directly by surface freshwater flux. River discharge seems to be the freshwater source for the plumes and has little to do with the evolution of the plumes.
关键词	Indian-ocean Seasonal Variability Southwest Monsoon Western Boundary Mixed-layer Circulation
DOI	10.1029/2005JC003308
URL	查看原文
收录类别	SCI
语种	英语
WOS记录号	WOS:000249337500001
引用统计	被引频次：12[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/6246
专题	海洋环流与波动重点实验室
作者单位	1.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Shandong, Peoples R China 2.State Ocean Adm, N China Sea Branch, Qingdao, Peoples R China 3.Chinese Acad Sci, Grad Sch, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Wu, Lingjuan,Wang, Fan,Yuan, Dongliang,et al. Evolution of freshwater plumes and salinity fronts in the northern Bay of Bengal[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2007,112(C8):C08017.
APA	Wu, Lingjuan,Wang, Fan,Yuan, Dongliang,&Cui, Maochang.(2007).Evolution of freshwater plumes and salinity fronts in the northern Bay of Bengal.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,112(C8),C08017.
MLA	Wu, Lingjuan,et al."Evolution of freshwater plumes and salinity fronts in the northern Bay of Bengal".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 112.C8(2007):C08017.

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